Padlock



Q (No Model.) A. STEWART.

PADLOGK. No'. 247,963. Patented oot. 4,1881.

N. PCTER; Filmulilhngnphen w; xxxxxxxxxx c.

UNITED STATES PATENT OFFICE.

ARTHUR STEWART, 0F PHILADELPHIA, ASSIGNOR OF ONE-HALF TO WILLIAM H. MATTSON, OF SHARON HILL, PENNSYLVANIA.

PADLOCK.

SPECIFICATION forming part of Letters Patent No. 247,963,11ated October 4, 1881,

Application filed August 8, 1881. (No model.)

To all whom it may concern:

Be it known that I, ARTHUR STEWART, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented an Improvement in Locks, of which the following is a specification.

The object of my invention is to provide for railway cars, switches, and for other uses a lock which shall have all the appearance of an inexpensive iron l0ck,.but which shall be as free, so far asthe operating parts are concerned, from the detrimental effects of exposure as a lock made wholly of brass. This object I attain in the manner-which I will now proceed to describe, reference being bad to the accompanying drawings, in which- Figure 1 is a perspective view, showing the outer case and shackle of the padlock; Fig. 2, a view of the cover of the case; and Fig. 3, a perspective view of the interior plate, with tumblers and other operating parts carried by the said plate.

Ais the iron case of the lock, and B the cover, adapted to the rim a of the said case, to which the'cover is to be riveted in the usual manner.

D is the shackle, having at one end a brass bushing, D, adapted to a pivot-pin, d, on the case, the slotted free end b of the said shackle being arranged to pass through an opening,c, in the rim of the case. r

The above description will apply to an ordinary padlock, which has been selected for the illustration of my improvement, for it should be understood that my invention may be applied to any style of lock which will permit the introduction 'intoan outer case of cast-iron of the plate G, of brass or any non-corrosive metal or alloy. This plate is made to fit snugly within the rim of the iron case, and is confined to the same by the cover B, so that when the plate is contained in the case it becomes essentially a fixed portion of the same, the operating parts of the lock being carried by the plate instead of being applied directly to the cast-iron case, as in ordinary looks. The plate Gr may be riveted to the outer case at one or more points, if desired.

My invention does not demand any specific kind of works or operating parts; but it is essential that these parts, or at least the greater portion of them, should be non-corrosive and carried by the plate of non-corrosive metal or alloy. The works consist, in the present instance, of the sliding spring-bolt H, tumblers I, and hook J, the construction and operation of which for retainingand releasing the slotted end of the shackle will be readily understood by those familiar with the construction of looks; The plate G also carries the stem h and guide 5 for the key, as well as the spring for the bolt.

Myinvention may be applied with advantage to all looks which are so exposed as to be liable to become rusted and their works inoperative, and it is especially applicable to padlocks used on railway cars or switches, for ordinary locks for this purpose are often made with cases of brass, which offer temptations to a class of thieves who are in the habit of stealing such locks, the losses of railroad companies through such pnrloining being very serious.

My improved lock has externally the appearance of'a common iron lock,and therefore is not a tempting looking affair in the eyesot' thieves. At the same time, the operating parts being non-corrosive and carried by a non-corrosive plate, they are not liable to become inoperative through accumulations of rust.

As a further provision against the detrimental effects of exposure, I prefer to line the iron cover B with a plate, f, of non-corrosive metal or alloy; or the inner face of the plate may be galvanized or otherwise coated, so as to resist the attacks of moisture.

It may not be necessary in some styles of looks that all the works should be non-corrosive or carried by the non-corrosive plate; but

it is important that the bolts, tumblers, and

ARTHUR STEWART.

Witnesses: V

HARRY DRURY, HARRY SMITH. 

